Modal symmetries at the nanoscale : a route towards a complete vectorial near-field mapping

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DOI http://dx.doi.org/10.1364/OL.39.002802
Reference B. le Feber, N. Rotenberg, D. van Oosten and L.K. Kuipers, Modal symmetries at the nanoscale : a route towards a complete vectorial near-field mapping, Opt. Lett. 39, (9), 2802-2805 (2014)

Abstract: We use symmetry considerations to understand and unravel near-field measurements, ultimately showing that we can spatially map three distinct fields using only two detectors. As an example, we create two-dimensional field maps of the out-of-plane magnetic field and two in-plane fields for a silicon ridge waveguide. Furthermore, we are able to identify and remove polarization mixing of less than 1/30 of our experimental signals. Since symmetries are prevalent in nanophotonic structures and their near fields, our method can impact many future near-field measurements.